Complex impedances are measured on cation exchanged layered silicates, H-, Na-and K-kenyaites (M2Si22O45·xH2O, M=cation) to investigate proton conduction in these materials. The impedances in every compound showed strong dependence on relative humidity. Proton conductivities were estimated to 8.2×10-7, 7.2×10-5 and 1.1×10-3S cm-1 for H-, Na-and K-kenyaites, respectively, at 95% relative humidity.
